Setting up cluster failover for IMAP
You can use a NOTES.INI setting to allow the IMAP server to support the ability for clients to fail over from one Domino® server to another when the user's primary mail server is unavailable.
About this task
This NOTES.INI setting controls the UIDVALIDITY
value
for folders to ensure they are different for each replica. Ensuring
that the UIDVALIDITY
value is different for replicas
on different servers forces the IMAP-compliant clients to discard
and re-fetch the cached data for messages in these folders, also ensuring
that the IMAP client is synchronized with the replica being accessed
after a failover.
Without the setting, the results when accessing
multiple replicas would be unpredictable if the IMAP client cached
information about messages in one replica that would not match the
content in another replica. This could happen if the UIDVALIDITY
value
matched for a particular folder, but the content of the folder differed
in any way.
Procedure
Results
The UIDVALIDITY
values used for each folder
will then be unique, as they will contain the "root" value specified
via the NOTES.INI setting.
Once IMAP has been enabled, a database is immediately available for IMAP access within the cluster. It is not necessary to complete these steps on every replica of a mail file before allowing access to those that have been re-enabled after setting the NOTES.INI parameter.